Other Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2016
Goodwill And Intangible Assets Disclosure [Abstract]  
Schedule of Other Intangible Assets

Other intangible assets consist of the following:

 

(in thousands)

 

June 30,

2016

 

 

December 31,
2015

 

Finite-lived intangible assets:

  

 

 

 

 

 

 

 

Customer relationships

 

$

94,265

  

 

$

93,572

  

Noncompete agreements

 

 

27,519

  

 

 

26,963

  

Trademarks

 

 

9,376

  

 

 

9,341

  

Internal-use software licenses

 

 

7,905

 

 

 

—

 

Patents

 

 

2,840

  

 

 

2,840

  

 

 

 

141,905

  

 

 

132,716

  

Accumulated amortization

 

 

(107,857

)

 

 

(101,479

)

 

 

 

34,048

  

 

 

31,237

  

Indefinite-lived intangible assets:

 

 

 

 

 

 

 

 

Licenses

 

 

16,884

  

 

 

16,877

  

 

 

$

50,932

  

 

$

48,114

  

 
Estimated Amortization Expense for Finite-Lived Intangible Assets

Estimated amortization expense for finite-lived intangible assets for the next five years is as follows:

 

Year

(in thousands)

 

Remainder of 2016

$

5,800

  

2017

$

9,449

  

2018

$

6,544

  

2019

$

4,295

  

2020

$

2,551

  

2021

$

1,143